Comparison and mathematical analysis of locust phototactic response to spectral illumination

Photoelectric inducing and trapping locusts is a technology for utilizing locust’s resource and avoiding environmental pollution of pesticide. To investigate the appropriate spectral illumination of locust’s photoelectric inducement, different spectral illumination of light sources were tested comparatively on locust’s photoelectric response using LED light source and phototactic behavioural trial equipment. On the basis of the comparative data of experiment, by establishing the mathematical model of locust’s photoelectric response to different spectral illumination, the scope of different spectral illumination threshold on locust’s phototactic response rate was analyzed, and the principle of different spectral illumination influence on the locust’s phototactic effect was discussed. The results show that under the same illumination of light source, locust’s inner phototactic response to purple light is the best, blue-green-purple light is the next. The result of mathematical solution show that locust’s phototactic response to its sensitive spectra has the requirement of the highest phototactic illumination threshold and the lowest phototactic sensitive threshold, and locust’s phototactic response to purple light is the lowest. Spectrum and light intensity influence the sensitive degree of locust’s phototactic response, so enhancing light intensity of locust’s sensitive spectrum can stimulate locust and intensify its phototactic response. In a certain range of illumination threshold, we can attain the approaching effect of locust’s phototactic response to purple light through reinforcing the light intensity of blue-green-purple light.